PAIS Index Includes citations to publications from over 120 countries throughout the world. In addition to English, some of the indexed materials are published in French, German, Italian, Portuguese, Spanish, and other languages. Updated quarterly, with over 17,000 current records added each year. Contains archival citations from 1915, including monographs, periodical articles, notes and announcements, and analytics. The original, historical subject headings have been retained.